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State the appropriate null and alternative hypotheses

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The mean waiting time at the drive-thru of a fast food restaurant from the time an order is placed to the time it is received is 84.3 seconds. A manager devises a new drive-thru scheme that he believes will decrease the waiting time. He initiates the new system and measures the waiting time for 10 randomly selected orders. The waiting times are provided in the table.

108.4

67.6

58.1

75.9

65.1

80.3

95.6

86.3

71.0

72.1

Assume that the data comes from a normally distributed population. At the 0.05 level of significance, is there enough evidence to conclude that the new scheme is effective?

a. State the appropriate null and alternative hypotheses.

b. Determine the critical value.

c. Draw a normal curve that shows the rejection region.

d. Write the correct decision and appropriate conclusion.

Reference no: EM132474350

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